We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissible in your locale.

Subject / Started by Last post
0 Replies
3839 Views
Last post February 25, 2025, 0815 UTC
by Robot Matrix
0 Replies
2968 Views
Last post April 08, 2025, 0028 UTC
by Looking-Glass
3 Replies
6442 Views
Last post April 15, 2025, 1323 UTC
by TRI International
1 Replies
9293 Views
Last post April 20, 2025, 0530 UTC
by Looking-Glass
0 Replies
2411 Views
Last post April 27, 2025, 1014 UTC
by TRI International
0 Replies
1955 Views
Last post April 27, 2025, 1016 UTC
by TRI International
0 Replies
2218 Views
Last post May 02, 2025, 0932 UTC
by TRI International
0 Replies
2138 Views
Last post May 02, 2025, 0935 UTC
by TRI International
0 Replies
2093 Views
Last post May 02, 2025, 0940 UTC
by TRI International
0 Replies
2061 Views
Last post May 08, 2025, 1111 UTC
by TRI International
0 Replies
2067 Views
Last post May 08, 2025, 1114 UTC
by TRI International
0 Replies
2703 Views
Last post May 08, 2025, 1118 UTC
by TRI International
0 Replies
1900 Views
Last post May 21, 2025, 0902 UTC
by TRI International
0 Replies
1910 Views
Last post May 21, 2025, 0904 UTC
by TRI International
0 Replies
2005 Views
Last post May 21, 2025, 0907 UTC
by TRI International
0 Replies
2253 Views
Last post May 22, 2025, 1000 UTC
by TRI International
0 Replies
2255 Views
Last post June 01, 2025, 1937 UTC
by Binjo
0 Replies
2185 Views
Last post June 20, 2025, 0909 UTC
by TRI International
0 Replies
3616 Views
Last post July 05, 2025, 0942 UTC
by Looking-Glass
0 Replies
6597 Views
Last post August 13, 2025, 1909 UTC
by europirate

 

Normal Topic
Hot Topic (More than 15 replies)
Very Hot Topic (More than 25 replies)

Locked Topic
Sticky Topic
Poll


HFUnderground T-Shirt
HFUnderground House Flag
by MitchellTimeDesigns